Year LCU per US$ 1960 4.5 1961 4.5 1962 4.5 1963 4.5 1964 4.5 1965 4.5 1966 4.5 1967 4.5 1968 4.5 1969 4.5 1970 4.5 1971 4.486829 1972 4.144753 1973 3.706589 1974 3.55 1975 3.517612 1976 3.53 1977 3.525065 1978 3.399562 1979 3.360837 1980 3.326742 1981 3.382508 1982 3.428171 1983 3.455 1984 3.524 1985 3.622 1986 3.703 1987 3.745 1988 3.745 1989 3.745 1990 3.745 1991 3.745 1992 3.745 1993 3.745 1994 3.745 1995 3.745 1996 3.745 1997 3.745 1998 3.75 1999 3.75 2000 3.75 2001 3.75 2002 3.75 2003 3.75 2004 3.75 2005 3.7471 2006 3.745 2007 3.7475 2008 3.75 2009 3.75 2010 3.75 2011 3.75 2012 3.75 2013 3.75 2014 3.75 2015 3.75 2016 3.75 2017 3.75 2018 3.75 2019 3.75 2020 3.75 2021 3.75 2022 3.75 2023 3.75